package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatPayUtil weChatPayUtil;

    @Value("${sky.shop.address}")
    private String shopAddress;

    @Value("${sky.baidu.ak}")
    private String ak;

    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //处理业务异常(地址簿为空，购物车数据为空)
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null){
            //地址不存在，抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //检查用户的收货地址是否超出配送范围内
//        checkOutOfRange(addressBook.getCityName()+addressBook.getDistrictName()+addressBook.getDetail());

        //查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart
                .builder()
                .userId(userId)
                .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0){
            //购物车为空，不能下单
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setAddress(addressBook.getCityName()+addressBook.getDistrictName()+addressBook.getDetail());
        orders.setUserId(userId);

        orderMapper.insert(orders);
        //向订单明细表插入n条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());//设置订单明细的订单id
            orderDetailList.add(orderDetail);
        }
        //批量插入
        orderDetailMapper.insertBatch(orderDetailList);

        //清空当前用户的购物车数据
        shoppingCartMapper.deleteAll(shoppingCart);

        //封装VO返回数据
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        /*//调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );*/

        //因为无法调用微信支付接口，所以模拟一下
        JSONObject jsonObject = new JSONObject();

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //通过websocket向客户端浏览器推送消息 type orderId content
        Map map = new HashMap();
        map.put("type", 1);//1表示来单提醒
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号："+outTradeNo);

        String jsonString = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(jsonString);

    }

    /**
     * 查询历史订单
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult pageQueryOrders(int pageNum, int pageSize, Integer status) {
        //设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = getOrderVoList(page);
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    public OrderVO queryOrderDetails(Long id) {

        //先根据订单id查出订单信息
        Orders orders = orderMapper.getById(id);
        //再根据订单id查出订单明细
        List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(id);

        AddressBook addressBook = addressBookMapper.getById(orders.getAddressBookId());
        orders.setAddress(addressBook.getCityName()+addressBook.getDistrictName()+addressBook.getDetail());
        //将以上信息封装进VO
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetails);

        String orderDishes = getOrderDishesStr(orders, orderDetails);
        orderVO.setOrderDishes(orderDishes);

        return orderVO;
    }

    /**
     * 用户取消订单
     * @param id
     */
    public void userCancel(Long id) throws Exception{
        //根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        //校验订单是否存在
        if (ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //判断订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (ordersDB.getStatus() > 2){
            //已接单之后的订单无法直接取消
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        //订单处于待接单状态下取消，需要进行退款
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            //调用微信支付退款接口 由于无法调用微信支付接口，直接跳过微信回调过程
            /*weChatPayUtil.refund(
                    ordersDB.getNumber(),//商户订单号
                    ordersDB.getNumber(),//商户退款单号
                    new BigDecimal(0.01),//退款金额，单位 元
                    new BigDecimal(0.01));//原订单金额*/

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        //更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     * @param id
     */
    public void repetition(Long id) {
        //根据id查询订单详情
        List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(id);

        //获取当前用户id
        Long userId = BaseContext.getCurrentId();

        //将订单中的餐品详情转换成购物车对象
        List<ShoppingCart> shoppingCartList = orderDetails.stream().map(orderDetail -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            //将原订单中的菜品信息复制到购物车对象中
            BeanUtils.copyProperties(orderDetail, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());
            return shoppingCart;
        }).collect(Collectors.toList());

        //将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 商家搜索查看订单
     * @param ordersPageQueryDTO
     * @return
     */
    public PageResult page(OrdersPageQueryDTO ordersPageQueryDTO) {
        //设置分页查询参数
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());

        //分页查询订单数据
        Page<Orders> orders = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = getOrderVoList(orders);
        return new PageResult(orders.getTotal(), list);
    }

    /**
     * //查出每个订单的详细数据并封装（抽取的公共方法）
     * @param orders
     * @return
     */
    private List<OrderVO> getOrderVoList(Page<Orders> orders) {

        List<OrderVO> list = new ArrayList<>();
        if (orders != null && orders.getTotal() > 0){
            for (Orders order : orders) {
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(order, orderVO);

                if (orderVO.getAddress() == null){
                    AddressBook addressBook = addressBookMapper.getById(order.getAddressBookId());
                    orderVO.setAddress(addressBook.getCityName()+addressBook.getDistrictName()+addressBook.getDetail());
                }

                Long orderId = order.getId();
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);
                orderVO.setOrderDetailList(orderDetails);

                String orderDishes = getOrderDishesStr(order, orderDetails);
                orderVO.setOrderDishes(orderDishes);

                list.add(orderVO);
            }
        }
        return list;
    }

    /**
     * 根据订单id获取菜品（只在本类中的使用的私有方法）
     *
     * @param order
     * @param orderDetails
     * @return
     */
    private String getOrderDishesStr(Orders order, List<OrderDetail> orderDetails) {
        //将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3）
        List<String> orderDishList = orderDetails.stream().map(orderDetail ->
                orderDetail.getName() + "*" + orderDetail.getNumber() + ";").collect(Collectors.toList());
        //将所有菜品拼接在一起
        return String.join("",orderDishList);
    }

    /**
     * 统计各个状态的订单数量
     * @return
     */
    public OrderStatisticsVO statistics() {
        //查询出待接单、待派送、派送中的订单
        List<Orders> ordersList = orderMapper.
                getThreeStatusOrders(Arrays.asList(Orders.TO_BE_CONFIRMED,Orders.CONFIRMED,Orders.DELIVERY_IN_PROGRESS));
        int toBeConfirmed = 0;
        int confirmed = 0;
        int deliveryInProgress = 0;
        if (ordersList != null && ordersList.size() > 0){
            for (Orders orders : ordersList) {
                if (orders.getStatus().equals(Orders.TO_BE_CONFIRMED)) toBeConfirmed++;
                else if (orders.getStatus().equals(Orders.CONFIRMED)) confirmed++;
                else if (orders.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) deliveryInProgress++;
            }
        }
        return new OrderStatisticsVO(toBeConfirmed, confirmed, deliveryInProgress);
    }

    /**
     * 商家接单
     * @param ordersConfirmDTO
     */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        //修改orders的状态
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 商家拒单
     * @param ordersRejectionDTO
     */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception{
        Long ordersId = ordersRejectionDTO.getId();
        Orders orders = orderMapper.getById(ordersId);
        //确保订单存在
        if (orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //订单只有处于待接单状态（2）才能接单
        if (!orders.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //由于无法调用微信支付接口 因此跳过退款步骤
        /*//支付状态
        Integer payStatus = orders.getPayStatus();
        if (payStatus == Orders.PAID) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    orders.getNumber(),
                    orders.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }*/
        //拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders1 = Orders.builder()
                .id(ordersId)
                .status(Orders.CANCELLED)
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .cancelTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders1);
    }

    /**
     * 商家取消订单
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        //根据订单id查询订单详情
        Long ordersId = ordersCancelDTO.getId();
        Orders orders = orderMapper.getById(ordersId);

        if (orders == null) throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (orders.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //微信支付相关代码跳过
        /*//如果已经支付需要退款
        Integer payStatus = orders.getPayStatus();
        if (payStatus == 1){
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    orders.getNumber(),
                    orders.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }*/

        //管理端取消订单需要更新订单状态、取消原因和取消时间
        Orders orders1 = Orders.builder()
                .id(ordersId)
                .cancelTime(LocalDateTime.now())
                .cancelReason(ordersCancelDTO.getCancelReason())
                .status(Orders.CANCELLED)
                .build();
        orderMapper.update(orders1);
    }

    /**
     * 派送订单
     */
    public void delivery(Long id){
        //查询出订单
        Orders orders = orderMapper.getById(id);

        if (orders == null || !orders.getStatus().equals(Orders.CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //更新订单状态
        Orders orders1 = Orders.builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();
        orderMapper.update(orders1);
    }

    /**
     * 完成订单
     */
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 客户催单
     * @param id
     */
    public void reminder(Long id) {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);

        //校验订单是否存在
        if (orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Map map = new HashMap();
        map.put("type", 2);//2表示客户催单
        map.put("orderId", id);
        map.put("content", "订单号："+orders.getNumber());

        String jsonString = JSON.toJSONString(map);

        webSocketServer.sendToAllClient(jsonString);
    }

    /**
     * 检查客户的收货地址是否超出配送范围
     * @param address
     */
    private void checkOutOfRange(String address) {
        Map map = new HashMap();
        map.put("address",shopAddress);
        map.put("output","json");
        map.put("ak",ak);

        //获取店铺的经纬度坐标
        String shopCoordinate = HttpClientUtil.doGet("https://api.map.baidu.com/geocoding/v3", map);

        JSONObject jsonObject = JSON.parseObject(shopCoordinate);
        if(!jsonObject.getString("status").equals("0")){
            throw new OrderBusinessException("店铺地址解析失败");
        }

        //数据解析
        JSONObject location = jsonObject.getJSONObject("result").getJSONObject("location");
        String lat = location.getString("lat");
        String lng = location.getString("lng");
        //店铺经纬度坐标
        String shopLngLat = lat + "," + lng;

        map.put("address",address);
        //获取用户收货地址的经纬度坐标
        String userCoordinate = HttpClientUtil.doGet("https://api.map.baidu.com/geocoding/v3", map);

        jsonObject = JSON.parseObject(userCoordinate);
        if(!jsonObject.getString("status").equals("0")){
            throw new OrderBusinessException("收货地址解析失败");
        }

        //数据解析
        location = jsonObject.getJSONObject("result").getJSONObject("location");
        lat = location.getString("lat");
        lng = location.getString("lng");
        //用户收货地址经纬度坐标
        String userLngLat = lat + "," + lng;

        map.put("origin",shopLngLat);
        map.put("destination",userLngLat);
        map.put("steps_info","0");

        //路线规划
        String json = HttpClientUtil.doGet("https://api.map.baidu.com/directionlite/v1/driving", map);

        jsonObject = JSON.parseObject(json);
        if(!jsonObject.getString("status").equals("0")){
            throw new OrderBusinessException("配送路线规划失败");
        }

        //数据解析
        JSONObject result = jsonObject.getJSONObject("result");
        JSONArray jsonArray = (JSONArray) result.get("routes");
        Integer distance = (Integer) ((JSONObject) jsonArray.get(0)).get("distance");

        if(distance > 5000){
            //配送距离超过5000米
            throw new OrderBusinessException("超出配送范围");
        }
    }
}
